Adam, If I'm looking in the right place (the redhat virtio ethernet adapter properties), there is nowhere to specify forcing the speed or duplex. The only value I see is Init.ConnectionRate (which is 10G). I've been able to see performance in excess of 2Gb/sec (when running an iperf against the ubuntu host on which the VM runs) so it doesn't think it's a 1G NIC; the performance is just very poor. The same iperf from a centos VM to its host gives > 9Gb/sec.
Thanks JR On 5/9/2014 1:19 PM, Adam Lawson wrote: > Is the duplex setting and speed set on each side to force 10ge (since > auto-neg seems to not work in this scenario)? Still waiting to hear back on > steps taken in the situation I described earlier. > > Mahalo, > Adam > > > *Adam Lawson* > AQORN, Inc. > 427 North Tatnall Street > Ste. 58461 > Wilmington, Delaware 19801-2230 > Toll-free: (844) 4-AQORN-NOW > Direct: +1 (302) 268-6914 > > > > On Fri, May 9, 2014 at 9:25 AM, JR <botem...@gmail.com> wrote: > >> I'd be very appreciative to hear how you solved this Adam. ;-) >> >> On 5/9/2014 12:29 AM, Adam Lawson wrote: >>> Look at the TCP stack within Windows and optimizations recommended by >>> Microsoft. I don't think it's a KVM or openstack question to be honest. >> We >>> ran into similar issues on plain old Win2008 R2 servers that were running >>> on bare metal. Will update again when I ping someone to find out what >>> specifically it was back then. >>> >>> >>> *Adam Lawson* >>> AQORN, Inc. >>> 427 North Tatnall Street >>> Ste. 58461 >>> Wilmington, Delaware 19801-2230 >>> Toll-free: (844) 4-AQORN-NOW >>> Direct: +1 (302) 268-6914 >>> >>> >>> >>> On Thu, May 8, 2014 at 6:59 PM, JR <botem...@gmail.com> wrote: >>> >>>> Greetings, >>>> >>>> My openstack grizzly cluster runs on ubuntu 12.04 servers with 10G NICs. >>>> I have ubuntu, centos and windows 2008 R2 guests. I've noticed that >>>> while both my linux guests can communicate at some reasonable >>>> approximation of 10G wire speed (e.g., 7-9Gb/sec on iperf tests), the >>>> windows guests max out at 2.5G when talking to the host on which they >>>> run, down to ~1.2G to other hosts. >>>> >>>> I've made some modifications as per this doc: >>>> >>>> http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry >>>> >>>> and upgraded my virtio network driver, but it's not helped. I've also >>>> done about an hour or two of googling which has revealed little. >>>> >>>> I understand that this is not an openstack issue, but, I suspect, others >>>> have encountered this when bringing 2008 R2 guests into their clusters. >>>> Anyone? >>>> >>>> Thanks much, >>>> JR >>>> >>>> >>>> >>>> _______________________________________________ >>>> Mailing list: >>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >>>> Post to : openstack@lists.openstack.org >>>> Unsubscribe : >>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >>>> >>> >> >> -- >> Your electronic communications are being monitored; strong encryption is >> an answer. My public key >> <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953> >> > -- Your electronic communications are being monitored; strong encryption is an answer. My public key <http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4F08C504BD634953> _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack